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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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VLAN Damping

VLAN Damping

In a specified VLAN where a VLANIF interface has been configured, when all interfaces in the VLAN go Down, the VLAN becomes Down. The interface Down event is reported to the VLANIF interface, causing the VLANIF interface status change. To avoid network flapping due to the status change of the VLANIF interface, you can enable VLAN damping on the VLANIF interface and set a delay after which the VLANIF interface goes Down.

With VLAN damping enabled, when the last Up interface in the VLAN goes Down, the Down event will be reported to the VLANIF interface after a delay (the delay can be set as required). If an interface in the VLAN goes Up during the delay, the status of the VLANIF interface keeps unchanged. That is, the VLAN damping function postpones the time at which the VLAN reports a Down event to the VLANIF interface, avoiding unnecessary route flapping.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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